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In Reply to: RE: besides shellac don't forget to try sidewall refleKtors posted by freddyi on August 31, 2007 at 11:31:34
Is the back cavity part of the transmission line (smooth
continuation of the tapered Koupler at the front), or is
the back cavity severely choked, as-if a tuned port box?I see trouble if the back were extremely broadband and
allowed to mix with the frontwave out of phase. I think
this is why the resistive port may be used on the 12 or
perhaps the shelf on the 15. Acoustic low pass filter.
Doubt the front of a K15's cone is loaded nearly as much
as the back when the baffle is so near the open end.
And Karlson's design conspires to blend them only over
a transitional range where both phases are compatible.I see a tuned port. Tuned a bit low, so there is perhaps
a big peak in low bass and dip in mid bass before the
front wave takes over loading the cone. Then the Karlson
loading is a bandpass boost to restore the midbass range.
Low cutoff set by 1/4 wavelength of the guide, and high
cutoff (for the back cavity only) set by the tuned port.
There is no such high cutoff for front side K loading,
but coupling is rather weak due to the placement near
the open end. Does this make any sense? Am I missing
something?There should be no such complication with the Rocket, all
fed from the same end. And K loaded over the full bandwidth.
But it would be far more directional at highest frequency.
And thats another kind of a complication...
Edits: 08/31/07Follow Ups:
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